The correct answer is D. Pooling of unusually warm water in the eastern tropical Pacific.
Explanation
The Niño phenomenon is a climatic event that is related to the warming of the equatorial eastern Pacific Ocean. This phenomenon usually has great effects in the continental zone of equatorial America, because it produces abundant rains and in some areas it causes the fish to move. The irruption of these warm waters is due to the atmospheric difference between the eastern or western Pacific Ocean. So, the correct answer is D. Pooling of unusually warm water in the eastern tropical Pacific.
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